Siemens ep1332-1sh71

By Abdullah Zahid
13 min read
Siemens 6EP1332-1SH71 PM1207 stabilized power supply DIN-rail mounted for SIMATIC S7-1200 control cabinet

Siemens 6EP1332-1SH71 SIMATIC S7-1200 Power Module PM1207 Stabilized Power Supply: Specifications, Selection Guide and Alternatives

Controls engineers specifying power for a SIMATIC S7-1200 system typically arrive at the Siemens 6EP1332-1SH71 after one of two paths: they are building a new cabinet and want a factory-matched supply, or they are replacing a failed unit and need an exact substitute fast. Either way, the decision hinges on three numbers — 24 V DC output, 2.5 A continuous current, and 18 mm DIN-rail width — and on whether the ATEX and UL certifications pre-loaded into this module match the site requirements. The 6EP1332-1SH71 is a single-phase, galvanically isolated regulated power supply that converts 120 V or 230 V AC mains input to stabilized 24 V DC for S7-1200 controllers, I/O modules, and field devices, with an MTBF rated at 1,492,537 hours at 40 °C.

If you have already confirmed this is the right part, check current pricing and availability for the 6EP1332-1SH71 at LeadTime.ca — ships worldwide.

Who Should Buy the 6EP1332-1SH71 — and Who Shouldn't

The Siemens 6EP1332-1SH71 is the correct choice for engineers who need a factory-matched, certified power source for a standard SIMATIC S7-1200 installation. Buy this part if all of the following are true for your application:

  • Your total DC load — PLC CPU, I/O modules, and connected field devices — does not exceed 2.5 A continuous output
  • Your mains supply is single-phase AC at 120 V or 230 V (the module accepts both, ±15%, at 47–63 Hz)
  • Your cabinet uses standard DIN-rail mounting with 18 mm width and 125 mm depth available
  • You require galvanic isolation between AC input and 24 V DC output per EN 60950-1 and EN 50178 for SELV compliance
  • Your site or project specification requires ATEX II 3G, IECEx, UL 508, or NEC Class 2 certification on the power module

If your system requires more than 2.5 A continuous output, redundant fail-over capability, or a three-phase AC input supply, this model is not the right fit — review the PM1207R or PM1207RF variants, or a larger SITOP supply, before ordering.

On this page:

What the 6EP1332-1SH71 Actually Does in Your Control Cabinet

The Siemens 6EP1332-1SH71, officially designated the SIMATIC S7-1200 Power Module PM1207 Stabilized Power Supply, is a DIN-rail mounted switched-mode power supply that sits at the energy entry point of an S7-1200 control system. It accepts single-phase AC from the panel's mains distribution — either 120 V or 230 V depending on regional supply — and delivers regulated 24 V DC at up to 2.5 A to the downstream control architecture. Galvanic isolation between the AC input and the 24 V DC output is built in per EN 60950-1 and EN 50178, which means the output qualifies as Safety Extra-Low Voltage (SELV) and no additional isolation barriers are required on the low-voltage signal side.

What separates this module from a generic industrial supply is the combination of factory matching to the SIMATIC S7-1200 platform and its pre-loaded certification stack — ATEX II 3G Ex ec nC IIC T4 Gc, IECEx, cULus (UL 508 File E197259), NEC Class 2 (UL 1310), UKCA, CE, EAC, and CB Certificate — which covers the majority of global regulatory requirements without requiring buyers to source or test additional approval documentation. For machine builders shipping panels internationally, that pre-certified status eliminates a meaningful layer of compliance administration.

The module also incorporates a soft-start output characteristic that prevents voltage overshoot at turn-on, and a constant-current short-circuit protection mode at 2.65 A typical, which protects wiring and connected devices without requiring a fuse on the output side. Buffering time at rated load is 20 ms minimum, which is sufficient to keep a standard S7-1200 controller alive through brief mains sags or breaker transition events.

Typical System Architecture for SIMATIC S7-1200 Power Distribution

In a typical SIMATIC S7-1200 cabinet, the 6EP1332-1SH71 sits immediately after the mains circuit breaker and feeds the 24 V DC rail that powers the CPU, I/O expansion modules, and terminal-side field devices. Understanding where it sits in the signal chain clarifies what it depends on upstream and what it protects downstream.

  • Single-phase AC mains supply (120 V or 230 V) enters the panel via a 16 A Type B or 10 A Type C miniature circuit breaker — required externally, not integrated into this module
  • The 6EP1332-1SH71 mounts on DIN rail immediately downstream of that breaker, receiving L, N, and PE connections at its screw terminals
  • The 24 V DC output (L+ and M terminals) feeds the SIMATIC S7-1200 CPU 24 V supply input and the common 24 V bus for I/O signal modules
  • Downstream field devices — proximity sensors, solenoid valves, indicator lights — draw from the same 24 V bus, with total current constrained to 2.5 A across all loads
  • For ATEX-classified zones, the module itself carries Zone 3 certification; no additional explosion-proof enclosure is required around the supply in II 3G environments

Where the 6EP1332-1SH71 Gets Deployed: Industries and Use Cases

Discrete manufacturing operations — automotive assembly, packaging machinery, and general-purpose conveyor systems — represent the most common deployment for this module. A single-phase 230 V AC supply is available at almost every machine feed point in these environments, and the 2.5 A output comfortably covers a standard S7-1200 CPU with four to six I/O expansion modules and a modest field device load.

Food and beverage plants frequently specify the 6EP1332-1SH71 for remote conveyor control and gating stations where the cabinet is compact, the load is predictable, and the certified isolation simplifies hygiene-zone electrical inspection. The module requires no forced-air cooling — natural convection carries it through a 0–60 °C operating range — which matters in washdown areas where fan filters accumulate contamination.

Chemical processing, grain handling, and oil and gas field instrumentation represent the most specification-critical deployments. The ATEX II 3G Ex ec nC IIC T4 Gc and IECEx IEC Ex nA nC IIC T4 Gc certifications allow this module to be installed in cabinets located in Zone 3 hazardous-atmosphere areas without an additional explosion-proof enclosure or standalone isolation barrier — a significant cost and space saving over non-certified alternatives.

North American machine builders using 120 V AC portable or semi-portable control enclosures — particularly in construction, mining, or field-deployed equipment — benefit from the dual-voltage auto-sensing input, which means the same catalog number covers both 120 V NA and 230 V export configurations without a hardware variant change.

Application Typical Deployment
Discrete manufacturing conveyor or gating station S7-1200 CPU + I/O modules on single-phase 230 V AC panel, 2.5 A or under total load
ATEX Zone 3 chemical or grain handling cabinet 6EP1332-1SH71 installed in II 3G zone without explosion-proof outer enclosure; T4 surface temperature group
North American portable control enclosure (120 V AC) Single catalog number serves 120 V NA and 230 V export builds; 1.2 A input current at 120 V
SIMATIC S7-1200 system retrofit or replacement Direct catalog substitute for aging or failed power module; no requalification required
Modular distributed automation facility One 6EP1332-1SH71 per S7-1200 node; independent regulated supply per cabinet reduces cross-system interference

Electrical Specifications Engineers Need Before Ordering

Parameter Value
Input Voltage 120 V AC or 230 V AC, single-phase, ±15%
Input Frequency 47–63 Hz
Input Current 1.2 A at 120 V AC; 0.67 A at 230 V AC
Output Voltage 24 V DC
Output Current (rated) 2.5 A continuous (0–2.5 A adjustable range)
Short-Circuit Protection Constant current at 2.65 A typical; output recovers on fault clearance
Buffering Time (min) 20 ms at 2.5 A, Vin 93–187 V
Galvanic Isolation Yes — SELV per EN 60950-1, EN 50178
Operating Temperature 0–60 °C (natural convection)
MTBF at 40 °C 1,492,537 hours

Full technical specifications are available on the product page at LeadTime.ca.

6EP1332-1SH71 vs. PM1207R vs. PM1207RF: Which Power Module Do You Actually Need?

The PM1207 family covers a range of output and monitoring requirements. Choosing the wrong tier means either paying for redundancy capability you will never use, or deploying a non-redundant supply in a system where an unplanned outage is unacceptable. The table below maps each variant to its distinguishing characteristic.

Model Output Current Redundancy Remote Monitoring Best For
6EP1332-1SH71 (this model) 2.5 A No No Standard production automation, non-critical loads, cost-sensitive OEM builds
PM1207R 2.5 A Yes (redundancy controller) No High-availability systems requiring automatic fail-over without network integration
PM1207RF 2.5 A Yes Yes (network fail-over logic) Critical systems requiring monitored redundancy and remote diagnostics

If your architecture uses a standard single-phase supply with no redundancy requirement and a total DC load under 2.5 A, the 6EP1332-1SH71 is the correct and most cost-effective choice — check current availability at LeadTime.ca.

Expert Verdict: Honest Assessment and Procurement Reality

The Siemens 6EP1332-1SH71 earns its position as the default power module specification for SIMATIC S7-1200 systems primarily because of its certification breadth, not just its electrical performance. For any system integrator shipping control panels to multiple regional markets, having a single catalog number that carries ATEX II 3G, IECEx, cULus (UL 508), NEC Class 2, UKCA, CE, and EAC approvals simultaneously is a genuine procurement advantage. The 18 mm width is one of the narrowest footprints available for a fully isolated 24 V supply at this current rating, and the 1,492,537-hour MTBF at 40 °C means realistic service life in a temperature-managed cabinet reaches 10–15 years without planned replacement. The soft-start characteristic and constant-current short-circuit protection at 2.65 A are not headline features, but they prevent wiring damage events that cause unplanned downtime — the kind of failure that generates maintenance calls at 2 a.m.

Where this module has real limits: the 2.5 A ceiling is firm. Any system with a moderately loaded S7-1200 CPU, a full complement of I/O expansion modules, and several active field devices can approach that limit quickly, and the constant-current protection mode will collapse the output voltage rather than gracefully shed load. Engineers specifying this module without a documented load calculation are taking a risk that shows up during system commissioning or — worse — during first production run. The other honest limitation is redundancy: this module has none. If your process cannot tolerate a power supply failure between scheduled maintenance windows, the PM1207R is the minimum specification.

On procurement: the 6EP1332-1SH71 is a high-volume catalog part with typically short lead times — most major distributors carry stock for delivery within one to four weeks. During supply chain disruptions, lead times have extended to four to twelve weeks in some markets; if your project schedule is tight, confirming stock before committing to a build date is the right move. If you are ordering ten or more units for an OEM panel build, volume pricing is available. View current stock and pricing at LeadTime.ca to confirm availability against your project timeline.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation: What to Know Before You Mount It

The 6EP1332-1SH71 is a passive regulated supply with no software configuration required. Installation is mechanical and electrical only. Key points to verify before mounting:

  • An external miniature circuit breaker — 16 A Type B or 10 A Type C — is mandatory on the AC mains input side; this module does not contain an integrated breaker, and omitting it voids safety approvals
  • Input terminals accept L (line), N (neutral), and PE (protective earth); output terminals are L+ (positive 24 V DC) and M (negative return); all screw terminals accept 0.5–2.5 mm² wire gauge
  • The module mounts on standard DIN rail; verify 18 mm width and 125 mm depth clearance in the cabinet before ordering — these are the mechanical constraints most often missed in retrofit applications
  • Soft-start response time is 2 seconds at 230 V AC input and 6 seconds at 120 V AC input; the green 24 V OK LED illuminating within that window after mains apply is the normal commissioning confirmation
  • For ATEX Zone 3 installations, confirm cabinet zone classification documentation and photograph wiring routes at installation — this is required for compliance audit, not just good practice

Compatible Modules and System Expansion

The 6EP1332-1SH71 is factory-matched to the SIMATIC S7-1200 product family. The following modules are directly powered by or integrated with this supply in standard S7-1200 cabinet builds:

  • SIMATIC S7-1200 CPU modules (1211C, 1212C, 1214C, 1215C, 1217C) — primary load on the 24 V DC output rail
  • SIMATIC S7-1200 digital and analog signal modules (SM 1221, SM 1222, SM 1223, SM 1231, SM 1232) — draw from the same 24 V bus; total current budget across all modules must remain under 2.5 A
  • SIMATIC S7-1200 communication modules (CM 1241, CM 1242, CM 1243) — additional 24 V consumers; include in load calculation
  • PM1207R redundancy controller — where high availability is added later, the PM1207R pairs with this supply as the primary unit in a redundant pair

Wrong-Part Prevention Checklist Before You Order

Before submitting a purchase order for the 6EP1332-1SH71, work through each item on this checklist. Every item on this list represents a documented return or field replacement root cause.

  1. Verify input voltage availability at site matches supply rating (120 V or 230 V AC, single-phase only)
  2. Calculate total DC load (PLC + all I/O modules + field devices) does not exceed 2.5 A continuous output
  3. Confirm DIN-rail space available; check mechanical dimensions (width 18 mm, depth 125 mm)
  4. If ATEX or hazardous-area certification required, verify this model has IECEx/ATEX approvals (it does)
  5. Check that input circuit protection is external (requires 16 A Type B or 10 A Type C breaker per datasheet)
  6. Confirm screw-terminal wire gauges (0.5–2.5 mm²) match available cable sizes
  7. Verify galvanic isolation between input and output is required; this model provides it per EN 60950-1

If all items check out, confirm stock and place your order at LeadTime.ca — or contact the team if you need a formal quote for procurement approval.

Frequently Asked Questions

Does the 6EP1332-1SH71 include an integrated circuit breaker?

No. The 6EP1332-1SH71 does not contain an internal circuit breaker on the AC mains input. An external 16 A Type B or 10 A Type C miniature circuit breaker is mandatory per the datasheet specifications. The cabinet design must allocate a separate DIN-rail breaker position for the AC input feed to this module. Omitting it voids safety approvals and warranty.

Can I use this supply on 120 V AC in North America?

Yes, the 6EP1332-1SH71 accepts both 120 V AC and 230 V AC input within ±15% tolerance across a 47–63 Hz frequency range. At 120 V AC, input current is 1.2 A for full 2.5 A output, compared to 0.67 A at 230 V. The 230 V version is more common in Canadian installations; confirm regional availability with your supplier before ordering to avoid lead time surprises.

What is the actual ride-through time if mains power drops briefly?

The 6EP1332-1SH71 provides a minimum buffering time of 20 ms at its rated 2.5 A output current, with input voltage between 93 V and 187 V. This is sufficient to keep a standard SIMATIC S7-1200 CPU running through typical mains sag or circuit-switching transitions. If your application requires longer ride-through — more than 100 ms — an external UPS or secondary buffering supply is required; this module alone does not provide uninterruptible operation.

Is the ATEX certification on this model sufficient for chemical plant or grain handling installation?

Yes, for Zone 3 classified areas. The certification is ATEX II 3G Ex ec nC IIC T4 Gc, which covers Zone 3 environments — locations where explosive atmospheres are unlikely to occur in normal operation, or occur only infrequently. This does not cover Zone 0 or Zone 1. No special explosion-proof enclosure is required for the supply itself in a Zone 3 cabinet, and no additional isolation equipment beyond the module is mandated. Standard industrial wiring practice applies.

What happens if my connected load exceeds 2.5 A?

The module enters a constant-current protection mode at approximately 2.65 A typical, at which point the output voltage collapses below the regulated 24 V level. The supply does not permanently fail from a momentary overload event, but sustained operation in this mode will eventually cause thermal limiting or trip the external mains breaker. The correct resolution is to reduce the connected load or add a secondary power supply to distribute current demand across two modules.

How long should I expect the 6EP1332-1SH71 to last in service?

The MTBF at 40 °C is 1,492,537 hours — a statistical mean time, not a guaranteed service life. Practical service life in a temperature-controlled industrial cabinet at 0–40 °C ambient is typically 10–15 years. The most common age-related failure mode is electrolytic capacitor degradation, which manifests as output voltage creep outside the ±3% regulation band. A semi-annual measurement of output voltage under full load is the simplest indicator of approaching end-of-life.

Why Order the 6EP1332-1SH71 from LeadTime.ca

  • LeadTime.ca ships worldwide — no single-region restriction on sourcing or delivery
  • Real-time stock visibility for the 6EP1332-1SH71 so you can confirm availability before committing a build date
  • Volume pricing available for OEM machine builders and system integrators ordering ten or more units
  • Direct access to sourcing support for hard-to-find or allocation-constrained SIMATIC parts during supply chain disruptions
  • Fast response for formal quote requests required by procurement approval workflows

At-a-Glance Summary

  • Catalog number: Siemens 6EP1332-1SH71 — SIMATIC S7-1200 Power Module PM1207 Stabilized Power Supply
  • Output: 24 V DC at 2.5 A continuous (0–2.5 A adjustable), short-circuit protected at 2.65 A typical constant current
  • Input: Single-phase 120 V or 230 V AC, ±15%, 47–63 Hz; input current 1.2 A at 120 V, 0.67 A at 230 V
  • Galvanic isolation: Yes, SELV output per EN 60950-1 and EN 50178; no additional barriers required on 24 V side
  • Buffering time: 20 ms minimum at rated 2.5 A output, Vin 93–187 V
  • Form factor: DIN-rail mount, 18 mm wide, 125 mm deep; screw terminals for 0.5–2.5 mm² wire
  • Operating temperature: 0–60 °C natural convection; storage/transport -40 to +85 °C
  • MTBF: 1,492,537 hours at 40 °C
  • Certifications: CE, UKCA, EAC, CB, cULus (UL 508 E197259), cURus (UL 60950-1 E151273), NEC Class 2 (UL 1310), ATEX II 3G Ex ec nC IIC T4 Gc, IECEx IEC Ex nA nC IIC T4 Gc
  • External protection required: 16 A Type B or 10 A Type C miniature circuit breaker on mains input — not integrated
  • Not the right part if: load exceeds 2.5 A, redundancy is required, three-phase input only, or 48 V DC output needed